add_filter() and add_action() are available before any plugin is loaded. So you can use both in the first line of your plugin or theme. For readability I recommend to group action and filter registrations at the very top of your main file: in a plugin, the file with the plugin header in a theme the … Read more
Sometimes certain hooks need to be fired at certain times. Example, some hooks need to be fired upon init. Add this to your __construct() add_action(‘init’, array(&$this, ‘init’)); Then add this function, which will contain all hooks that need to be fired upon init. public function init(){ add_action(‘hook_name’, array(&$this, ‘your_method_name’)); add_action(‘hook_name’, array(&$this, ‘your_method_name’)); add_action(‘hook_name’, array(&$this, ‘your_method_name’)); … Read more
I don’t think there exist one, but you could create your own, wpse_empty_trash, with something like this: /** * Add a custom hook ‘wpse_empty_trash’ */ add_action( ‘load-edit.php’, function() { add_action( ‘before_delete_post’, function ( $post_id ) { if ( ‘trash’ === get_post_status( $post_id ) && filter_input( INPUT_GET, ‘delete_all’ ) && 1 === did_action( ‘before_delete_post ‘ ) … Read more
I prefer hooks, since they are more flexible: you can hook into them from your theme’s functions.php file, but also from plugins. I try to put as much logic in plugins, so that the themes contain mostly layout stuff. If you use an action hook, it is still possible to use get_template_part() in that hook … Read more
range of priority values? range of priority values? Generally, speaking, you can’t know a priori what priority something is hooked with. The priority needed depends on how other callbacks where hooked in. Often that is the default value of 10 but it could be anywhere between PHP_INT_MIN (negative integers are still integers) and PHP_INT_MAX and … Read more
I don’t think an action has been added. You can look at version details for any version and see any new actions added. The WordPress Way to run code on plugin update is what is described here: The proper way to handle an upgrade path is to only run an upgrade procedure when you need … Read more
Well, there is another way. And better, I guess. You should look at register_post_type parameters. You should probably set them like this: ‘public’ => false, // it’s not public, it shouldn’t have it’s own permalink, and so on ‘publicly_queryable’ => true, // you should be able to query it ‘show_ui’ => true, // you should … Read more
For removing an action hook you should use the same action name, callback name and the priority that was used to add a action in parent theme. And register it on init add_action( ‘init’, ‘remove_my_action’); function remove_my_action() { remove_action( ‘woocommerce_before_shop_loop’,’storefront_sorting_wrapper’,9 ); } Read about remove_action
Like kaiser answered template_redirect hook is indeed appropriate for redirects. Also you should use wp_redirect() function, rather than setting header.
You can see the detailed list of the hook using this snippet: $hook_name=”admin_bar_menu”; global $wp_filter; var_dump( $wp_filter[$hook_name] );